Disconnecting means

[JJWalecka]

Some RTU units have an internal disconnecting means from the factory...where in the code does it state that the factory internal disconnect meets the requirements for equipment shut down

 

[JJWalecka]

440.14 Location. Disconnecting means shall be located within sight from, and readily accessible from the air-conditioning or refrigerating equipment. The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment.

So that means if the unit comes with one...im alset?

 

[James L]

Yes, factory installed is good.

 

[don_resqcapt19]

Note that the disconnect must be readily accessible, so if it is behind a cover that requires a tool to open, it doesn't count as the required disconnect.

 

[LarryFine]

Right, it must be externally accessible.

 

[don_resqcapt19]

Right, it must be externally accessible.

It can be internal if the cover has thumb screws.

 

[LarryFine]

It can be internal if the cover has thumb screws.

I consider that to be accessible.

 

[electrofelon]

It can be internal if the cover has thumb screws.

I consider that to be accessible.

But that is dangerous because if someone tightens the thumb screw with pliers, the universe will collapse into a singularity

 

[infinity]

I agree that the integral disconnect can serve as the disconnecting means for the unit but why have a heard a hundred times that the disconnecting means must removal all power to the unit. Or in other words it must be external to the unit.

 

[electrofelon]

I agree that the integral disconnect can serve as the disconnecting means for the unit but why have a heard a hundred times that the disconnecting means must removal all power to the unit. Or in other words it must be external to the unit.

I think that is generally not true. Although it seems logical to have the disconnect external and detached from the unit, I dont think its ever required is it? for example, here is the 440 requirement:

440.14 Location. Disconnecting means shall be located within sight from, and readily accessible from the air-conditioning or refrigerating equipment. The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment.

 

[infinity]

I think that is generally not true. Although it seems logical to have the disconnect external and detached from the unit, I dont think its ever required is it? for example, here is the 440 requirement:

440.14 Location. Disconnecting means shall be located within sight from, and readily accessible from the air-conditioning or refrigerating equipment. The disconnecting means shall be permitted to be installed on or within the air-conditioning or refrigerating equipment.

I'm hearing that it's an OSHA or some other safety requirement that the unit will have no live parts when the disconnecting means is opened.

 

[electrofelon]

I'm hearing that it's an OSHA or some other safety requirement that the unit will have no live parts when the disconnecting means is opened.

Perhaps, I don't know nuttin' 'bout that.